Dear fellow users,
I just started training the BME688 gas sensors (Dev Kit) using the AI Studio. The recorded samples (30 minutes) of coffee and (30 minutes) air were imported successfully into the AI Studio. I created a model (around 95% accuracte with few errors in the confusion matrix) using all default values and exported the .config and .aiconfig and saved them in the SD card. But when I ran the live-test from the mobile app, it did not matter which class I chose, it always reported it was coffee whether I put the sensors (Dev Kit) in a container containing coffee or not. I also created another model including all data channels instead of the default gas data channel only, trained the model and saved the exported config files to the SD card. The Live-test still reported coffee whether I put the sensors in the coffee jar or not.
I even selected the Example Project from the AI Studio, selected the 'coffee or not' model, exported and saved the config files in the SD card, the result was the same: always coffee even it should have been air!
Note: I always deleted the .config and .aiconfig from the SD card before copying the new config files to it.
If this issue has been solved before, please forgive me, I could not find it searching the topics.
Solved! Go to Solution.
As BME688 application note(https://www.bosch-sensortec.com/media/boschsensortec/downloads/application_notes_1/bst-bme688-an001....) mentioned before you start with the measurements, there are three things to keep in mind:
When you record data, there are 4 steps: record normal air, record espresso coffee, record normal air again, record filter coffee.
Thanks for the reminder, BSTRobin.
My question to you BSTRobin is what can I try? Run the dev kit for another 24 hours, change the .bmeconfig to certain values recommended by you? I welcome any suggestion.
We have the same problem and are curious why this could be.
After achieving a high accuracy in the AI studio, we ran it on the mobile app. First, it was coffee, then relatively quickly changed to air. After a few minutes, we stuck it almost on top of the coffee beans. Nothing happened. Only one channel changed after several minutes. I have to say that this is not encouraging.
Here is an update after spending more time with the Dev Kit:
I was able to get further than before but still having some issues. I have summarised what I did, the results and my questions for the experts reading this post. If you have encountered these issues and resolved them, or have an explanation for them, please let me know.
What I did
raw Data shows coffee but Prediction page still showing all air
Took a long time to correctly prediction air after taking the dev Kit out of the coffee container
Thanks in advance.